Wood-sawing machine.



vD. l.. CRISTlv WOOD SAWJNG MACHINE. APPLlcAloN man MAR. u. |911.

mmm 1M. 26, ma,

3 SHEETS-SHEET l.

DONALD L. CFzlST L. CRIST.

WOOD SAWING MABHINE.

APPLICATION FILED MAR. 17. m11.

Mmm-ed FQTm Mm 3 SHEETS-SHEET 2- D. L. CRISY.

WOOD SAWING MACHINE.

Armenien mw MAR. 11. |911.

Mmmm Feb. 26,1918.

TJONHLD L. Cms-r DONALD L. CRISI, OF RICHWOOD, WEST VIRGINIA.

woon-snwnve nnen-run.

Specification of Letters Patent.

Patented Feb, 181W..

Application led March 17, 1917. Seria1 No. 155,548.

To cZZ 'whom t may concern:

Be it known that l, DONALD L. CRIs'r, a citizen of the United States, residing at Richwood, in the county of Nicholas and State of West Virginia, have invented certain new and useful lmprovements in lVood- Sawing Machines, of which the following is a specification, reference being had to the accompanying drawings.

This invention relatesA to certain improvements in wood sawing machines and has relation more particularly to a device of this general character wherein a circular saw is employed and wherein said saw is mounted upon a traveling carriage; and it is an object of the invention to provide a device of this general character having novel and improved means whereby the carriage is positively driven in a direction toward the work and whereby the same is automatically moved in a direction away from the work.

The invention also has for an object to provide a device of this general character wherein the saw-mounted uponv the travelingcarriage is rotated through the medium of a belt and wherein a tightener coacts with the belt, the weight of the tightener serving to aord automatic means for imparting movement to the carriage in a direction away from the work.

Figure 1 is a view partly in elevation and partly in section illustrating a Wood sawing machine constructed in accordance with an f embodiment of my invention;`

Fig. 2 is a view in top plan of the machine as disclosed in Fig. 1 with the floor or platform and the driving belts omitted;

Fig. 8 is a view in front elevation of the device as herein set forth, the floor or plat-v form being in section; and

Fig. 4 is a view partly 1n elevation and partly in section illustrating a wood sawing machine arranged in accordance with a further embodiment of my invention.

As disclosed in the accompanying drawings, F denotes a foundation which may be `the floor of a building and upon which is mounted the elongated beams 1 arranged in parallelism and in predetermined spaced relation. Mounted upon the upper faces of the beams 1 are the rails 2 and 3. The rail 2 has its tread substantially flat while the tread portion of the rail 3 is substantially Vin the form in cross section of an inverted V.

C denotes a carriage comprising a substantially rectangular frame and coactmg with said carriage C are the supporting wheels 4 and 5.

The peripheries of the wheels 4 arranged at one side of the carriage C are flat and ride upon the rail 2, while the peripheries of the wheels 5 are grooved )to-.properly ride upon the rail 3.

Disposed transversely of the carriage C adjacent the forward end thereof is a shaft or mandrel 6 to one end portion of which and beyond a side of the carriage C is suitably clamped a circular saw S, while the opposite end portionof said shaft or mandrel 6 at a point beyond the opposite side of the carriage C is provided with the balance wheel W.

Suitably aiiixed to the shaft or mandrel 6 at substantially the longitudinal center Ythereof is a pulley 7 around which is directed an endless belt 8. The belt 8 has a stretch thereof extending below the founda- Ain close proximity to the driving shaft 11 is the end portion of an elongated arm 12. Saidarm 12 is positioned intermediate the foundation F and the upper stretch of the belt 8 and has its free end portion disposed Vin a direction toward the forward end of the beams 1. The free end portion of the arm A12 `rotatably supports the idle pulley 14 which is constantly in contact with the upper stretch of the belt 8. It is to be under-` stoodthat the combined weight of the arm 12 and the pulley 14 is such as to maintain the belt 8 tight and also to afford automatic means to impart movement to the carriage in a direction away from the work and which function of the arm 12 and pulley 14 is materially facilitated by having the free end portion of the arm 12 extended in a direction reverse to the direction of travel of the carriage C under the influence of the combined weight of the arm 12 and the pulley 14.

Suitably secured to the rear portion of the carriage C is the longitudinally disposed beam 15A to the under face of which is secured the rack 16, said rack being preferably extended along the entire length of the ofy the forward end of said beams. shaft 17 is provided witha gear 19 in mesh beam 15.V *Y

The rack 16 is` constantly inoperative Vconnection with thetransversely disposed shaft 17 rotatably supported by the'members lSpo'sitione'd' adjacent the innerfaces of the beams 1 at a predetermined point inwardly The with the pinion 20 atliXed to a second shaft Y `V A21 arranged in parallelism with the shaft 17.

.around apulley 28 afliXed to the shaft 29`to is` also secured." It is also gto be stated that the shafts 21 and 25 are also mounted upon the members 18 hereinbefore specified.

`Disposed through one of the beams 1 and which the pulley 9, hereinbefore referred to,

rotatably supported thereby is a short shaft 30. suitably keyed, as at 31,to the eccentric bearing 22V and the outer end portionof said shaft 30is provided with a lever 32 whereby Y Y' the wheel 24 whereupon y it will beat once'self-evidentthat the requisite rotation may be given to the bearing 22 as'to causet'h'e frictionwheel 23 toy eng-age or move away fromV the friction wheel 24.

Whenthe friction Vwheels 23 vand 24 are in contact the carriage C will be caused to move forwardl or in direction toward the work .i a

and-when the sawing operationY has been completed the wheel 23 is moved away from the' weightV of the arm 12 together with the idle'pulley 14 as limposed upon the upper stretch of the belt `Siwill cause the carriage VC to move rear- 45.

wardly or .in a direction 'away from the work lSo that the saw S will be in' proper position for asecondoperation.V The rearward or by the' bufergB;

return movement of the carriage C is limited *Each ofthe buffers-,B as herein disclosed Hcomprises an elongated member 33 disposed longitudinally .of the Ybeams 1 andloosel 'disposed through a transverse beam or bloei 34.# The outer end of 'said member 33 is provided with a head 35 and interposed between said head 35 and the adjacent face of the beam or block 34 is an expansible member 36 Vvherein VdisclosedY as a conventional coil spring encircling said elongated member 33. Y Y

` The opposed-faces lof the beams lare provided with the longitudinally disposed strips '.37 beneath whi'cheXtend the angular portions-38 formed at the lower ends A:of the rods 39 depen'ding'from the sides of the carriage mined distance its free event I find it of advantage to employv the en'ibodiment' of my invention as illustrated in Fig. 4. In this latter arrangement of my invention the belt 8 extends upwardly from the pulley 7 and has its upper stretch disposedaround the pulley-s 9 and 10 dependingk from a ceilingv or other support at a Y predetermined distance above the foundation F, and wherein said pulleys are in predetermined spaced relation longitudinally of the machine. Also pivotally engaged at one end with a ceiling or other support and above the upper stretch of the belt 8, is the elongated arm 12a having its free 'end portion provided with the idle pulley 14l resting upon the upper stretch of the belt 8a and serving the same purposes as has hereinb'efore been set forth relative to the arm 12 and its pulley'14. The belt 27a coacting 'with the pulley 26a alsov extends upwardly and engages the pulley 28n aiiixed to a shaft 29L towhich the pulley')aL is also secured.

I In this latterform of'my-invention I also -ind it of advantage to provide the supplemental rails 2fl which are held a predeterabove the' beams 1a by the straps 40 or other suitable means. These rails 2a are engaged by the peripheral portions of the wheels 4a whereby it will be at once self-evident that the rails 2a afford an effective means for holding the carriage C against displacement.

I` claim:

l. In combination a member mounted for reciproca-toryV movement, a rotatable member carriedk thereby, an idle pulley, a driving pulley interposed between the idle pulley and the rotatable member carried by the reciprocating member, an 'endless Ibelt disposed around the idle pulley, the driving pulley and the rotatable member, a swinging arm positioned above the stretch of a belt, and a wheelearried by the free end portion of the swinging arm' and contacting directly with the upper face of said stretch of the belt, said arm'and wheel being of a weight to automatically move the reciprocatmg member in -one direction and to maintain the belt at proper tension to operate said rotatable member during' the movement of the reciprocating member, said arm having end portion extended in a direction opposite to the' direction ofv travel of the-reciprocating member under 'the infinence -of the arm andwh'ecl.

2. In combination a member mounted for ing arm 1,257,680 ltllt reciprocating movement, a rotatable member carried thereby, a driving pulley positioned therebelow and inwardly of the limit of movement of the reciprocating member in one direction, an idle pulley positioned below thereciprocating member and at a point beyond the limit of its movement in the second direction, said idle pulley being` positioned above the driving pulley, an endless belt disposed around the rotatable membei` and driving pulley and the idle pulley, si vertically swinging arm positioned above the upper stretch of the belt, and a roller carried by the free end portion of the swingand contacting' directly `with the upper stretch of the belt, Said arm and pulsignature in the presence of two witnesses.

DONALD L. CRIST.

Witnesses:

A. B. CAMPBELL, T. M. RICHARDS.

Copies et this patent may be obtained for ve cents each, by addressing the Gommissioner ot Patenti.

Washington, D. C. 

